Mill for rolling tapered disks



A. CHRISTIANSON. MILL FOR ROLLING TAPERED DISKS.

APPLICATION man lULY 21.1920.

1,399,334, Patented Dec. 6, 1921.

3 SHEETS-SHEET NH INVENTOR -A. CHRISTIANSON.

MILL FOR 'ROLLING TAPERED DISKS.

APPLICATION FILED JULY 21, 1920; v

Patented Dec. 6, 1921.

3 SHEETS-SHEET 2- INVENTOR WITNESSES g A. CHRISTIANSON.

MILL FORROLLING TAPERED DISKS. APPLICATION FILED JULY 21,1920.

1,399,334. Patnted Dec. 6,1921

SSHEETS-SHEET 3.

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WITNESSES IN VE N TQR waauvm I I M 7 m M I UNITED STATESPATENT OFFICEHARNOLD cnnrs'rmivsoiv, or DETROIT," -MICH IGAN.

MILL FOR ROLLING TAPERED 'D'ISKS.

To all who-m it may concern.

Be it knownthat I, ARNOLD CHRISTIAN- soN, a resident of Detroit, in thecounty of Vayne and 'State of Michigan, have invented a new and usefulImprovement in Mills for Rolling Tapered Disks, (Case of which thefollowing is a specification.

The invention relates to rolling apparatus designed particularly forconverting metal lie cup shaped blanks into disksof decreasing thicknessfrom near their centers to their peripheries.

In my application of even date herewith, Serial No. 397,958, isdescribed a method of forming disks for steel wheels, such as usedonmotor cars, which are of decreasing thickness from near their centersto their peripheries, said method consisting in taking a circular metalplate, forming it into a deep cylindrical metal cup, preferably bypunch-drawing through-a die or succession of dies, and then subjectingthe walls of the cup'to a rolling action applied circumferentiallythereof, and giving the greatest reduction at the open end of the cupand gradually decreasing toward its bottom, thereby expanding the blankcircumferentially, progressively through different stages of flare, to asubstantially flat disk which tapers from near its center to itsperiphery.

The apparatus of this application is one form for converting such cupshaped blanks into disk form.

In the accompanying drawings Figurel is a plan view of the machine; Fig. 2 is a central longitudinal vertical section thereof; and Fig.3 is atransverse section on the line 33, Fig. 1.

In the drawings 1 indicates a cup-shaped blank, preliminarily flared,for reducing to disk form. 2 and '3 are spinning rolls, preferablyofconical form as shown and mounted in suitable bearings with their axesconverging so as to permit both rolls to enter the cup-shaped blank.These rolls are so mounted that the angle between their axes can beprogressively increased. As shown the respective shafts of said rollsare mounted in bearings 4 and P on carriers '5 and 5, respectively,which carriers are pivotally secured to the main frame 6 at 7 and 7respectively. The outer end of each carrier is provided with an inwardlyprojecting portion Sextending underneath and outwardly projectingport-ion 9 of the main frame, in order to prevent the outer ends of thecarriers from rising. Attached to lower Specification of LettersPatent." Patent d D 6; 1921 Application ,filed July 21,

1920. Serial No. 397,957.

the two roll carriers 10, which are formed the centers 7 and"? of therespective roll carriers; -These rack bars are engaged respectively bypinions 11 and 11 journaled on verticalaxesiin the main slightly higherthan the other,

on an arc struck from but with the portion of pinion 11' meshing withthe-upper. portion of pinion 11. The rack bar 10 is engaged by'the'upperportion of pinion 11 and the rack bar 10 by the lower'portion of pinion11 pinion 11 is extended upwardly as a shaft 12 provided with a handwheel 13,-so that by rotating said hand wheel the two pinions lland ll'are rotated in opposite directions are rack bars 10 and rame, one

The axis of and consequently. move the rack bars 10 and 10 and the rollcarriers'to which the latter are attached, in opposite directions.

The cup shaped blank will be provided with a central openingin itsbottom for'receiving a fastening member 15 whose shank extends throughsaid opening and secures the cup to the plate or disk 16. The latter ispro'vided with a shaft mounted in bear mgs 17 and with suitable drivingmeans, such as a pulley 18 adapted to receive a belt coming from anysuitable source. The

bearings 17 are carried on the upper ends of standards 19 rising from acarriage 20 mounted in suitable ways 21in the main frame so as to movelongitudinally therein, toward and from the rolls 2 and 8. Any suitablemeans may be used for moving the carriage back and forth, the drawingsshow a typical lathe carriage movement, compris mg a rack 22 on thecarriage engaged by a a pinion 23 on a'transverse shaft 24L mounted inthe main frame and provided on its outer end with a hand wheel 25.

In the use of the apparatus described a cup-shaped blank, formed in anysuitable way and preferably given a suflicient flare to allow bothconical rolls 2 and 3 to enter the same, is secured to the disk 16 whilethe carriage. 20 is in retracted position. The carriage 20 is then movedforwardly to move the blank over the ends of both rolls 2 and 3 whichwill be in their positions of closest approximation, as shown in fulllines in Fig. 1. A relative rotary motion will then be imparted to theblank and the rolls,

will be of uniformly and gradually decreasgreatest extent at the openend of the cup,

ings 4 and 4* preferably will be of the antifriction type. The movementdescribed produces a rolling spinning action which expands thecup'shaped blank and thinsits walls. The roll carriers 5 and 53 arecaused to slowly separate, by the gearing above de scribed, thuschanging the angular positions of the roll shafts and graduallyincreasing the flare of the cup, until finally itswalls are flared outas a' substantially fiat disk, against the face of the rotary disk 16,as indicted by the dotted line positions of the rolls 2 and3 in Fig. 1.Inasmuch as the walls of the cup will be expanded to their and theamount of expansion decreases gradually and uniformly toward the bottomof the cup, where it is zero, the finished disk ing thickness or taper"from that portion which forms the bottom of the cup blank to theperiphery of the disk; The action producing this is a rolling spinningaction, tending to expand thelwalls of the cup circumferentially only,there being substantially no flow of the metal in a direction radiallyof the completed disk. Consequently the size of the finished disk can'beaccurately regulated by forming the cup so that its depth plus one-halfof its diameter is equal to onehalf the diameter of the finished disk.The finished disk can be given such taper that the cross sectional areaon any circle outside of the portion which forms the bottom of thecup-shaped blank will be equal to that of any other circle. Since thereis no movement of the metal radially of the finished disk, there is notend- 1 ency of the metal to form into waves, and no strains producedwhich would tend to cause radial cracks fromthe periphery of the disk.

The details of the apparatus described may be varied within wide limits.In a machine where a large output is sought, automatic mechanism may beused in place of the hand wheel 13 for varying the angular positions ofthe roll carriers and for rap idly bringing the roll carriers back tonormal position at the completion of the rolling of a blank, and alsosuitable power mechanism, such as an air or hydraulic cylinder, may besubstituted for the rack and pinion mechanism illustrated for moving thecarriage 20 back and forth, in order to secure a quicker movement wherespeed is desired.

I claim:

1. In an apparatus for converting me-' tallic cup-shaped blanks intodisks, the combination of a rotarydisk or plate on which tively, andmeans for changing the angular relation of the axes of said roll andsaid disk respectively.

2. In apparatus for converting metallic 'jcup-shap'ed blanks into disks,the combination of adisk or plate on which the cupshaped blank is heldby its bottom, a pair of conical rolls entering said blank from its openend, means for imparting relative rotary movement to said disk and rollsrespectively, and means for progressively in- CltiilSlIlg the anglebetween the axes of said r0 s.

3. In apparatus for converting metallic cup-shaped blanks into disks,the combination of a rotary holder to which the cupshaped blank issecured by its bottom, rotary spinning means entering said cupshapedblank and bearing against the wall thereof, and means formovingsaidrotary holder and spinning means relative to each other toimpart the greatest spinning action to said cup-shaped blank at its openend and gradually decreasing toward its bottom.

4. In apparatus for converting metallic cup-shapedblanks into disks, thecombination of a rotary blank holder to which the bottom of the blank issecured, a spinning roll adapted to enter the cup-shaped blank, meansfor progressively changing the angle of the axis of thespin'ning rollrelativeto the axis of the blank holder, and a carriage movable towardand from the spinning roll and provided with bearings for the rotaryblank holder.

5. In apparatus for converting metallic cup-shaped blanks into disks,the combination with a pair of conical spinning rolls, hearings in whichthe same are rotatably mounted, a rotatable blank holder to which thecup-shaped'blank is secured by-its bottom, a carrier for said blankholder movable toward and from the spinning rolls to'carry thecup-shaped blank over said spinning rolls, and means for progressivelyincreasing the angular relation between the axes of the spinning rolls.

6. In apparatus for converting metallic cup-shaped blanks into disks,the combination of a rotatable blank holder to which the cup-shapedblank is secured by its-bottom,

of a pair of conical spinning rolls arranged to enter said blank fromits open end, carriers in which said spinning rolls are rotatablymounted, said carriers being pivoted on axes located close to theposition of the plane of the bottom of the cup-shaped blank, and meansfor progressively moving said roll carriers in opposite directions.

In testimony whereof, I have hereunto set my hand.

ARNOLD CHRISTIANSON.

Witnesses: I

LYMAN, H. FRAZIER,

' CHARLES H. RUPPEL.

